I am seeing the exact same issue on a PC I just put together and loaded Fedora 43 Workstation on. If I hook the 3.5mm jack for the speakers (older Creative Pebbles) to the green port on the back panel it shows up just like OP’s when I try to test; however, if I plug the jack into the headphones port on the case (which is connected to the motherboard audio pins) it detects and works properly. I was also seeing some Dummy Output options with the line out connection in use, and not knowing what it meant, I selected one and this kicked me back to the login screen and gave me an unhelpful kernel alert.

In contrast, the speakers on my other PC, which is also running Fedora 43 Workstation, works fine off of the back panel. Both motherboards are using Realtek audio chips but it may not be the same version since one board is a B650 and one is a B550.

Curious to see what the solution ends up being but I also recently installed pavucontrol on the newer PC so I will try and set the speakers up using the line-out that way. If that doesn’t work I will migrate to bluetooth speakers or just leave things as is.

This is really interesting. I started with Mint-Cinnamon since it sounded like it would be ideal for me as I had no desire to switch to Windows 11 and I needed a daily driver OS; I did not like Mint at all and spent too much time trying to make it work with newer hardware. Fedora Workstation has been a great experience for me and it checks all the boxes with minimal troubleshooting. What is about Arch that made you decide to switch? Genuinely curious as I am all-in on Linux now that I know I can do productivity stuff and gaming so easily and I don’t have to give another dime to MS.